Welcome to our Tuesday Tutorial, where we share a short FREE quilting video lesson each week. Let’s jump right in and learn about one of the most common pieces used in traditional patchwork, the half-square triangle, also known as HST.

Note: please click any image to go directly to the video lesson.

Why you’re going to love this technique: HSTs refer specifically to right isosceles triangles, meaning triangles in which two sides of equal length form an interior angle of 90°. When a pattern calls for HSTs, you’ll find that the longest side of each triangle is cut on the bias, which means additional piecing challenges due to bias edges tending to stretch quite easily. Feeling a little frightened at this point?! Never fear – we’re here to show you the easy-peasy way to make quick work of this common quilting shape!

Tricia Camp explains and demonstrates how to layer two simple squares together, stitching them in such a way that you’ll end up with two HSTs, without needing to handle the raw bias edges of the patches. You’ll also learn the easy formula for determining what size to cut your squares to end up with the exact HST size your pattern calls for.

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We here at Keepsake Quilting are dedicated to bringing you all the fabrics, notions, tools, and kits you love—plus expert advice on how to use them to make beautiful quilts, table toppers, wall hangings, accessories, and more. We enjoy quilting just as much as you do, so we’re always up for fun contests, events, and ways to live the quilting lifestyle. As we observe our 30th anniversary, we hope you will join the discussion and celebrate with us!
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One thought on “Introduction to Half Square Triangles”

I need a stain removal advice. I have some antique quilt blocks embroidered by my Mom on white cotton. Some of the blocks have brown stains from being stored in a card board box. Does anyone know how to remove these stains? Thank you.

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